<template>
  <div>
    <span>全选:</span>
    <input type="checkbox" v-model="fn"/>
    <button @click="fn1()">反选</button>
    <ul v-for="item in arr" :key="item.name">
      <li>
        <input type="checkbox" v-model="item.c"/>
        <span>{{item.name}}</span>
      </li>
    </ul>   
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [
        {
          name: "猪八戒",
          c: false,
        },
        {
          name: "孙悟空",
          c: false,
        },
        {
          name: "唐僧",
          c: false,
        },
        {
          name: "白龙马",
          c: false,
        },
      ],
    };
  },
  methods:{
    fn1(){
      this.arr.forEach(item=>item.c=!item.c)
    }
  },
  computed:{
    fn:{
      get(){
        return this.arr.every(item=>item.c)
      },
      set(value){
        this.arr.forEach(item=>item.c=value)
      }
    },
  }
};
</script>

<style>

</style>